Wrought copper alloy, copper alloy part, and process for producing wrought copper alloy

A manufacturing method and technology of copper alloys, applied in the field of metal parts, can solve problems such as easy fracture and use restrictions, and achieve the effects of excellent machinability, suppression of reduction in insertion and extraction force, and excellent strength and conductivity.

Inactive Publication Date: 2013-01-02
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason for this is that lead does not form a solid solution in the copper alloy, so it is finely dispersed in the material, and chips are easily broken in this part during cutting.
However, the use of lead is being restricted due to its impact on the human body and the environment, and the demand for materials that improve machinability without containing lead is increasing

Method used

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  • Wrought copper alloy, copper alloy part, and process for producing wrought copper alloy
  • Wrought copper alloy, copper alloy part, and process for producing wrought copper alloy
  • Wrought copper alloy, copper alloy part, and process for producing wrought copper alloy

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Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0057]

[0058] Nickel (Ni) and silicon (Si) in a preferred embodiment of the copper alloy wrought material of this embodiment are added for the purpose of controlling the content ratio of Ni and Si to form a metal base (base, base) Ni-Si precipitates (Ni 2 Si), thereby carrying out precipitation strengthening, so that the strength and electrical conductivity of the copper alloy stretched material are improved. The Ni-Si precipitates (Ni 2 Si: precipitates for precipitation strengthening) does not play a large role in the improvement of machinability.

[0059] In a preferred embodiment of the copper alloy wrought material of this embodiment, the addition of sulfur (S) forms sulfides in the matrix that contribute to the improvement of machinability. This sulfide acts as a starting point for chip breakage during cutting, so that the chip chips are easily broken into fine pieces and the machinability is improved. In addition, by controlling the cooling rate during casting to...

no. 2 Embodiment approach

[0078]

[0079] In the copper alloy wrought material of the present embodiment, the content ratio of Ni and Si is also controlled. Its purpose is the same as that of the first embodiment.

[0080] In a preferred embodiment of the copper alloy wrought material of this embodiment, the addition of sulfur (S) forms sulfides in the matrix that contribute to the improvement of machinability. This sulfide acts as a starting point for chip breakage during cutting, so that chips are easily broken finely and machinability is improved; this is the same as the above-mentioned first embodiment. Sulfides are formed during casting, but most of them exist in grain boundaries when formed, and deteriorate hot workability and cold workability (that is, elongation). Therefore, for the sulfide formed in the ingot (cake billet or steel slab), by stretching and heat treatment, the sulfide with an area ratio of 40% or more in the cross section parallel to the stretching direction exists in t...

Embodiment 1-1

[0112] Copper alloys having the compositions shown in Table 1-1 were melted in a high-frequency melting furnace, and each slab was cast at a cooling rate of 0.5° C. / sec to 5° C. / sec. The diameter of the billet was set to 200 mm. The above billet was hot extruded at a temperature of 950° C., and immediately quenched in water to obtain a round bar with a diameter of 20 mm. Next, the above-mentioned round bar was cold drawn to produce a round bar with a diameter of 10 mm, and aging heat treatment was performed at a temperature of 450° C. for 2 hours.

[0113] For each copper alloy stretched material (round bar) sample thus obtained, [1] tensile strength, [2] electrical conductivity, and [3] machinability were investigated in the following manner. The measurement method of each evaluation item is as follows.

[0114] [1] Tensile strength

[0115] According to JIS Z 2241, three copper alloy stretched materials were measured, and the average value (MPa) was given.

[01...

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Abstract

Provided is a wrought copper alloy which has excellent cuttability and extensibility and is optimal for applications where high strength and / or high electrical conductivity is necessary while alleviating environmental burdens. The wrought copper alloy contains 1.5-7.0 mass% Ni, 0.3-2.3 mass% Si, and 0.02-1.0 mass% S and optionally further contains at least one element selected from a group consisting of Sn, Mn, Co, Zr, Ti, Fe, Cr, Al, P, and Zn in a total amount of 0.05-2.0 mass%, with the remainder comprising Cu and incidental impurities. The wrought copper alloy contains a sulfide dispersed therein which contributes to an improvement in cuttability, the sulfide having an average diameter of 0.1-10 [mu]m and an areal proportion of 0.1-10%. The wrought copper alloy has a tensile strength of 500 MPa or more and an electrical conductivity of 25% IACS or more.

Description

technical field [0001] The present invention relates to metal parts used in electronic equipment, precision machinery, automobiles, etc., particularly to copper alloy parts produced by cutting, and further relates to a copper alloy stretched material suitable for the copper alloy parts and a manufacturing method thereof. Background technique [0002] As a method of manufacturing metal parts, there are cutting processes such as turning and piercing. Machining is a processing method that is effective in the manufacture of parts with particularly complex shapes or parts requiring high dimensional accuracy. When cutting, machinability often becomes a problem. Machinability includes items such as chip handling, tool life, cutting resistance, and roughness of the cutting surface. To improve these items, it is necessary to improve the material. [0003] Copper alloys are used in a large number of metal parts for reasons such as high strength, excellent electrical and thermal cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/06C22C9/00C22C9/01C22C9/02C22C9/04C22C9/05C22C9/10C22F1/08C22F1/00
CPCC22C9/10C22C1/10C22F1/00C22F1/08C22C9/06C22C9/00C22C9/01
Inventor 高桥功金子秀雄镰田千纲山本义弘小田健作仓桥和夫小关和宏
Owner FURUKAWA ELECTRIC CO LTD
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